A novel sandwich-type polyoxometalate compound with visible-light photocatalytic H-2 evolution activity

A tin(II) tungstosilicate derivative K11H[Sn-4(SiW9O34)(2)]center dot 25H(2)O with four sandwiched Sn2+ cations was prepared by reaction of SnCl2, KCl and Na-10[alpha-SiW9O34]center dot xH(2)O. Visible-light photocatalytic H-2 evolution activity was observed with Pt nanoparticles as co-catalyst and methanol as sacrificial agent.